twin rocks

I appreciate all of the quick replies. I called the parts store where i bought the filter and they suggested a shop close by that could do a fuel pressure test. They connected up to the hose at the isolator and read 20 psi at idle, while the gauge read 6 psi. So the problem is probably in the isolator. Nice guys, too, and they didn't charge me. A big load off my mind. Thank you again for all the prompt response.

I'm thinking it could be the pump, too but idon't want to spend time and money on a fuel pumpI I don't need, like i did with the fuel filter. The gauge says "auto meter pro comp ultra lite must be used with isolator". Can't see a nodel numberThere is a rubber hose going into a red, fairly flat, cylinder (the isolator?), and from there into a braided stainless hose that goes into the dash. So, mechanical, i'm guessing?

New member here. I had the lock/unlock issue. I rerouted the main ground wire away from the alternator. That worked for about 1000 miles, then on a rainy day the problem came back. While searching the net for other solutions I reccognized mopar1973man's logo from a post I read on another forum. His post at the beginning of this thread made a lot of sense to me, as I had thought for some time that alternator noise was the cause of the problem. So, I tried the test removing the 140 amp fuse, and the truck shifted normally. I bought a rebuilt alternator and had it installed. I have just completed a 3000+ trip towing a fifth wheel and there has been no issue. I sure there are several other causes for this problem, but the alternator was the cause for mine. I just wanted to thank mike nelson for this forum and this thread in particular.

I have a 98 cummins 24v just turned 92000 miles, stock as far as i know. It sis come with 2 gauges, boost and fuel pressure, though itès only 15psi. It used to bury the needle just after startup. But recently, on a fifth wheel trip to the southeast, it started at about 9 psi and slowly rose to about 14 psi. It was shortly after a fiilup so i thought it might be bad fuel, so i added some diesel kleen in the white bottle and things seem to improve somewhat. I continued on to cold Canada, where i am cuurently at a friends place and the fifth wheel is sitting in a public parking lot (with permission, of course). Yesterday I started it up and it was at 6 psi, and rose slowly to 12. I changed the fuel filter, but it didn't help.This morning I had to move the truck and it was even lower at about 4 psi. The truck has run ok all along, no hard start, no white smoke, no loss of power. However, at about the same time the tailpipe began making a rattling noise at idle. Don't know if that's related or not. Does anyone have any ideas or suggestion? I'll appreciate any help i can get.